Increased TGF-β gene expression in HSC+FC recipients. Splenocytes harvested 28 days after BMT from HSC+FC (n = 4) and HSC+T_BM (n = 3) recipients were analyzed using real-time PCR for cytokine gene expression. Relative differences in expression levels among HSC+FC recipients compared with HSC+T_BM recipients are shown as log 2-fold change mean ± SD.